A comparative study of impression procedures for distal extension removable partial dentures.

Area of Science:

• Dental Prosthodontics
• Impression Techniques
• Biomaterials

Background:

• Accurate impression techniques are crucial for fabricating well-fitting removable partial dentures.
• Tissue displacement during impression making significantly impacts denture stability and patient comfort.

Purpose of the Study:

• To compare the efficacy of three distinct impression methods: Hindels method, selective tissue placement, and functional reline.
• To determine which method achieves the most favorable mucosal tissue placement for denture fabrication.

Main Methods:

• Autopolymerizing acrylic resin platforms with orthodontic buccal tubes were constructed.
• Three impression methods (Hindels, selective tissue placement, functional reline) were applied to these platforms.
• Tissue placement measurements were taken in anterior, middle, and posterior regions of the mandibular ridge.

Main Results:

• The selective tissue placement method yielded the maximum tissue displacement (7.547 mm), followed by the Hindels method (7.211 mm).
• The functional reline method resulted in the least tissue displacement (5.856 mm).
• Tissue placement was significantly greater with the Hindels method compared to the functional reline method (p < 0.001).

Conclusions:

• The selective tissue placement method provides superior overall tissue displacement, making it a preferred technique for impression making.
• Maximum tissue placement occurred in the posterior region, followed by the middle and anterior regions, across all tested methods.